Core drill



Sept. 27, 1927.

H. B. HALVORSEN CORE DRILL' Filed March 26/1921 I71/v e1 a1 Ha 2713/? A Patented Sept. 27, 1927.

UNITED STATES 1,643,338 PATENT OFFICE.

HALBERT BQHALVoRsEN, or CHICAGO, ILLINOIS, ASSIGNOR '10 SULLIVAN MACHILF any COMPANY, A CORPORATION or MASSACHUSETTS.

CORE DRILL.

*Applicationfiled March 26, 1921. Serial No. 456,012.

My invention relates to core drilling mechanisms and more particularly to boring tools of the double tube core barrel type for use with such mechanisms.

An object of my invention is to provide an improved boring tool. further ob ect of my invention is to provide an improved boring tool of the double tube core barrel type. A still further object of my invention is to provide an improved bor ng tool havingan improved double thrust bearing for the inner core barrel. Further objects of my invention will appear hereinafter. I

In the accompanying drawlngs, I have shown for purposes of illustration, one embodiment which my invention may assume In practice.

In these drawings,

Fig. 1 is a central longitudinal section through the upper end of a double tube core barrel provided with my improved construction.

Fig. 2 is a transverse section on the line 22 of Fig. 1.

Fig. 3 is a similar section on the line 33 of Fig. 1. I

v In boring tools of the double' tube core barrel type which are employed in drilllng in friable formations, it is customary to employ an outer barrel and, concentrically arranged within the latter, an inner core barrel, the outer barrel being attached to the drill rod and rotating with the same while the inner barrel remains stationary. In order to permit'the inner barrel to rema n stationary, and so to protect the core; from the friction of the rotating parts, aball thrust bearing is arranged between the upper ends of the inner and outer barrels. In the accompanying drawings and the present specification I disclose an improved and simplified type of ball thrust bearing 1n which the balls are enclosed, thereby preventing, in the event of pos'sible'loosemng of the thrust, the escape of the balls and In the illustrative embodiment, I have shown asocket element 1 at the upper end of the outer core barrel and this I provide with an internal threaded socket 2 for attachment to the drill rod. As the drill rod With doubletube core barrels is normally hollow for the supply of water, passages 3 and 3 extend from the lower end of the socket 2 to the outer periphery of the member 1 and then longitudinally thereof by means of extensions 4 consisting of grooves extending longitudinally in the periphery of the memher. The periphery of the member 1 at its lower end is somewhat reduced in diameter though still cylindrical in form and is externally threaded as shown at 6 for the purpose of making a threaded connection with the internal threads 7 upon the upper end of the outer core barrel 8. This core barrel partakes of therotation of the drill rod and carries at its lower end the diamondbit (not shown) Concentrically disposed within the outer core barrel is the inner core barrel 9 spaced from the inner wall of the outer barrel by a slight distance to permit the flow of water between them and to reduce friction. Threadedly engaged with the upper end of the barrel 9 is a member 10 which is bored throughout its length as indicated at 11 and provided within said bore with a hollow hanger 12 secured therein in any suitable manner, herein by a transverse pin 13. The member 12 is provided with an enlarged annular collar or head 14; at its upper extremity, This collar :is freely received in a socket 15 formed centrally of the lower end of the member 1. The member 1, at a point below the socket 15, is provided with a slightly larger cylindrical bore 16 and at,

nular collar or sleeve 18 is slipped over the member 12 and likewise a ball bearing pro 'vided with a double race as indicated. at 20.

The relative. position of the collar 14 and the upper end of the upwardly extending annular collar 21 on the member 10 is so adjusted prior to the securing of the members 12 andlO by the pin 13 that the ball race is held in approximately proper relative position with respect to members 10 and 12. l i hen now the sleeve 18 is screwed movement as to member 1 except rotation about a longitudinal axis. In assembling the parts, the inner core barrel is first con-i nected to the member 1. and the outer core barrel is thereafter slipped over the inner barrel and screwed on to the threads prepared for it.

'From the -foregoingdescription, 1t W111 be obvious that by means of a single ball thrust bearing, I have providedmechanism whlch will hold the inner core barrel in fixed relative position to the outer core barrel both while raising the core and while drilling, and which will also provide relatively frictionless rotation between the parts.

l -Jhilc I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: l a

1. In a'core drill, the combination with an outer core barrel having a drill rod connection; of a rotatable inner core barrel positively supported in said outer core barrel and precluded against any substantial longitudinal movement relative thereto, a single ball thrust bearing, a mounting for the latter in rigid relation to the drill rod connection, and means associated with the inner core barrel for transmltting longitudinal 'thrustin either direction therefrom to said ball thrust bearing I I 2. In a core drill, the combination with an outer core barrel, of a rotatable inner core barrel and means for positively supporting said inner core barrel within the outer one and precluding any substantal lon-i gitudinal movement relative thereto, said means including but a single ball bearing and means for supporting the weight of said inner barrel thereon and for transmitting the upward thrust of said inner barrel thereto during drilling operation. r

3. In a core drill,the combination with an outer core barrel, of a rotatable inner core barrel, and means for positively supporting said inner core barrel within the outer one, and precluding any substantial longitudinal movement relative thereto, said means including a hanger member secured to said inner core barrel, a ballthrust mounting secured to said outer core barrel, and but a single ball thrust bearing between a portion of said hanger member and said mounting, said mounting being adapted to support said ball bearing against any substantial longitudinal movement in either direction independently of said hanger. p

4. In a core drill, the combination with an outer core barrel, of a rotatable inner core barrel and means for, supporting sald inner core barrel within the outer one, said means including a hanger member secured to said inner core barrel, a ball race mounting secured to said outer core barrel and but a sinble ball thrust bearing between a portion of said hanger member and said mounting, said inner core barrel also havingamember secured thereto for transmitting upward thrust to said ball thrust bearing and said ball race mounting having a portion to receive the upward thrust from said ball thrust bearing.

5. In a core drill, the combination with an outer core barrel, of a rotatable inner core barrel positively supported in said outer core barrel and precluded against any substantial longitudinal movement relative thereto, a hanger secured thereto and having oppositely disposed thrust distributing surfaces, and but a single antifriction bearing disposed between said surfaces and held in fixed position relative to said outer core barrel. i l

6. In a core drill, thecombination with an outer core barrehof an inner core barrel rotatablewith respect thereto, and means for I positively supporting said inner core barrel within said outer core barrel and precluding any substantial longitudinal movement relative thereto, lncluding but a single ball thrust bearing adapted .to receive longitudinal thrust of said inner core barrel in either direction, said supporting means-wholly enclosing said ball bearing. r

7. In a core drill, the combination with an outer core barrel, of an inner core barrel rotatable with respect thereto, and 1 means including but a single ball bearing fixed against any substantial longitudinal movement with respect toone of the same and means carried by the otherthereo'f engaging the opposlte sides of saidball'bearing for positioning said inner barrel.

8. In a core drill, the combination .withan I outer core barrel having a threaded and shouldered bore, a separable member cooperating therewith to form a second shoulder, 1 an inner core barrel 7 rotatable relative to said outer core barrel, a member 00- operating-therewith to form a third shoulder, and a single thrust bearing cooperating with saidsecond and thirdmentioned shoulders for receiving the longitudinal thrust of said inner core barrel ineither direction. a

9. In a core drill, a plurality of relatively rotatable innenand outer barrel members, a single bearing means adapted to allow said barrel members to cooperate, and means whereby said bearing means will have a normal operative relationwith respect to one of bers, a single bearing means adapted to allow cooperation between said barrel members, and means whereby said bearing means will be maintained in a normal operative relation to one of said barrel members and adapted to be so maintained during relative lpngitudinal movement between said memers.

11. In a core drill, a plurality of relatively rotatable inner and outer barrel members,

a bearing, and means whereby said single bearing is maintained in anormal operative relation to one of said members and held against any substantial longitudinal movement relative thereto but adapted to be removed therefrom, said bearing and member forming a unit adapted to cooperate with said other barrel membervwithout disturbing said bearing.

12. In a core drill, a plurality of relatively rotatable inner and outer barrel members, a single bearing means, means whereby one of said members is adapted to removably support said bearing means but adapted to maintain the same in a normal operative re-' lation to said member, and connecting means carried by said member, said member, bearmg and connectlng means forming a unit and said unit being adapted for cooperation with said other member without disturbing said bearing means.

13. In a double tube core-barrel drill, the

combination of a' swivel head, an outer tube fixedly attached to said head, an inner tube loosely secured to said head, whereby the outer tube and head may rotate with re-' spect to the inner tube, and a single bearing interposed between said head and inner tube for taking thrusts in eitherdirection longitudinally of the center of rotation of said head and outer tube.

14L. In a double tube core-barrel drill, the combination of a swivel head, an outer tube connected to'said head, an inner tube head to which said inner tube is rigidly connected, an anti-friction bearing comprising a pair of raceways interposed between said heads, said inner tube being suspended from one of said raceways, and a shoulder on said swivel head on which the other raceway of said bearing is supported. a

15. In a double tube core-barrel drill, the combination of a swivel head having a recess therein, a bushing in said recess, an anti-friction bearing comprising a pair of raceways in said recess with one of said raceways supported on said bushing, an outer tube carried by said swivel head, and an inner tube suspended from the other raceway of saidbearing.

In testimony whereof I affix my signature HALBERT' B. HALVORSEN. c

CERTIFICATE OF CORRECTION.

Patent No. 1,643. 338. Granted September 27, 1927, to

HALBERT B. HALVORSEN.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 57, claim 3, after the word "one" strike out the comma; same page, line 100, claim 6, after the word "thereto" strike out the comma; page 3, line 17, claim 11, strike out the word "single" and insert the came before the word "bearing", in the same line; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 1st day of November, A. D. 1927.

M. J. Moore, Seal. Acting Commissioner of Patents. 

